new Speedmaster calibre 321 owners - accuracy query

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No, of course no-one would expect quartz watch accuracy - but if a watch loses or gains (say) 30 seconds a day, that can become significant over the course of a week or month. A watch is a tool that needs to be able to show the correct time. I suppose one could just re-set the time every few days - but using your car analogy - if your car tyres were excessively wearing due to incorrect alignment - the correct thing to do would be to get the tracking and alignment set correctly - not to live with the poor handling and tyre wear. 😀

There are many mechanical watches that gain or lose around 30 seconds a day, e.g. Seiko watches, entry level eta movements.

By the standards of mechanical watches, the 321 movement is pretty good.

Honestly though, accuracy really isn't that big of a deal. I mean do you actually need to know the time to within 10 seconds a day? In my opinion, most people don't.

Adjusting the time every once in a while is part of the charm, and something I look forward to, because it gives me an excuse to interact with my watch.
 
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Try winding it on a different schedule. maybe 36 hours. If I wind my new321 every morning it starts to run fast. At the last end of the power reserve it runs slow -15seconds quickly. I Also have a feeling placement has influence like Evitzee says. Mine was running 10 seconds fast in the beginning, and later it was back again spot on time. In the last six months I had to adjust by 1 minute twice. It somehow finds its balance after a while and runs pretty accurate.
-2+12 range
 
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Have only owned mine for 5 days, but began testing accuracy on the way home in the plane, no internet access had me looking for something to do. +3.0 /s with fastest daily rate of 3.6 and slowest of 2.4.

Have not had a specific daily winding time as yet, so I imagine the variance will improve simply winding the watch at the same time each day.